摘要
随着先进涡轮发动机性能的进一步提升,寻求低热导率、高热膨胀系数的新型陶瓷材料已经成为热障涂层领域的研究热点。计算机数值模拟在新型陶瓷及其涂层性能研究方面发挥了重要作用。综述了新型热障涂层陶瓷材料相结构、热物理性能、力学性能和对应涂层隔热性能、涂层有效热导率及涂层热应力等几个方面国内外计算机数值模拟研究成果,并指出了以上几个方面计算机数值计算研究存的不足。未来材料物理性能计算应当多研究元素掺杂及新材料相结构随温度和压力的变化关系,开发新的数学模型提高热导率、热膨胀系数及各种力学性能参数的计算精度。涂层的隔热性能和有效热导率方面应当进一步系统化,将各种涂层结构、涂层显微组织、材料组成及导热方式的影响考虑在内,开发新的计算方法并提高计算精度;涂层的冲击和残余热应力计算中未引入基体条件(材质、尺寸、粗糙度、温度)、涂层结构、界面形貌、涂层缺陷、单层厚度、服役环境等方面的影响,并应注重与实验结果进行对比。
With the further property improvement of advanced turbine engines, searching for new candidate ceramics with low thermal conductivity and high thermal expansion coefficient has become one of the key research directions in the fields of thermal barrier coatings. The computer numerical simulation has played a more important role in the property research of ad- vanced coating ceramics and the corresponding coatings. Research progress of computer simulation in ceramic phase structure, its thermophysical properties, mechanical parameters, coating insulation activity, coating effective thermal conductivity and coating thermal stresses was summarized. The research shortcomings of above several aspects were also indicated. In the future, the structure variation with temperature and pressure of doped elements and new ceramics should be considered. In order to in- crease the computational precision of thermal conductivity, thermal expansion coefficient and every mechanical parameters, a novel mathematic model maybe developed. The calculation of thermal insulation and effective thermal conductivity of coatings should be further systemized and the influence of structure, microstructure material composition and thermal conduction style must be included. New calculation methods need to be developed in order to increase computational accuracy. In the thermal shocking and residual stresses computation, the effect of substrate conditions （including material, size, roughness and tempera- ture）, coating structure, interface morphology, coating defects, layer thickness and working environment must be contained, and the simulation results should be compared with that of experiments.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2016年第9期56-64,共9页
Surface Technology
基金
国家自然科学基金(U1304512)
河南省高校科技创新人才支持计划项目(13HASTIT018)
河南省科技攻关计划项目(132102210142)
河南省博士后科研资助项目(2014069)~~
关键词
热障涂层
新型陶瓷材料
热物理性能
热应力
thermal barrier coatings
new ceramic materials
thermophysical property
thermal stress
